Submission #897557

#	Time	Username	Problem	Language	Result	Execution time	Memory
897557		bleahbleah	Security Guard (JOI23_guard)	C++17	12 / 100	17 ms	4208 KiB

guard

#include <bits/stdc++.h>
#define all(x) (x).begin(),(x).end()
using namespace std;

using ll = long long;
using ld = long double;

#define int ll
#define sz(x) ((int)(x).size())

using pii = pair<int,int>;
using tii = tuple<int,int,int>;

vector<int> S;

signed main() {
  cin.tie(0) -> sync_with_stdio(0);
  int n, m, q;
  cin >> n >> m >> q;
  S.resize(n);
  
  for(auto &x : S) cin >> x;
  
  ll sum = 0;
  
  for(int i = 0; i < n - 1; i++)
    sum += (S[i] == S[i + 1]) * S[i];
  S.erase(unique(all(S)), end(S));
  
  n = sz(S);
  
  vector<int> mx;
  if(sz(S) > 1 && S[0] > S[1])
    mx.emplace_back(S[0]);
  
  for(int i = 1; i < n - 1; i++) {
    if(S[i] > S[i - 1] && S[i] > S[i + 1])
      mx.emplace_back(S[i]);
    
    if(S[i] < S[i - 1] && S[i] < S[i + 1])
      mx.emplace_back(S[i]);
  }
  
  if(sz(S) > 1 && rbegin(S)[0] > rbegin(S)[1])  
    mx.emplace_back(S.back());
    
  for(int i = 0; i < n - 1; i++)
    sum += max(S[i], S[i + 1]);
  
  for(int i = 0; i + 2 < sz(mx); i += 2) 
    sum -= min(mx[i], mx[i + 2]) - mx[i + 1];
    
  cout << sum << '\n';
  
  
}

• Subtask 1: 12 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 12
• Subtask 4: 0 / 13
• Subtask 5: 0 / 8
• Subtask 6: 0 / 18
• Subtask 7: 0 / 24